Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2751
PUT
Equinor
EQNR
$95.9B
| $1.32M | ﹤0.01% |
41,800
-33,300
| -44% | -$1.08M |
|
2752
CALL
Nordson
NDSN
$16.5B
| $1.32M | ﹤0.01% |
5,000
+4,300
| +614% | +$997K |
|
|
PGTI
2753
DELISTED
PGT, Inc.
PGTI
| $1.32M | ﹤0.01% |
32,409
+15,330
| +90% | +$498K |
|
2754
CALL
ATI
ATI
$27B
| $1.31M | ﹤0.01% |
28,900
-6,400
| -18% | -$266K |
|
2755
PUT
Viking Therapeutics
VKTX
$4.04B
| $1.31M | ﹤0.01% |
70,600
+34,400
| +95% | +$450K |
|
2756
CALL
Iris Energy
IREN
$13.2B
| $1.31M | ﹤0.01% |
183,500
+200
| +0.1% | +$860 |
|
2757
ACM Research
ACMR
$5.83B
| $1.31M | ﹤0.01% |
+67,124
| New | +$1.17M |
|
2758
PUT
Blue Owl Capital
OWL
$6.39B
| $1.31M | ﹤0.01% |
88,000
+25,600
| +41% | +$344K |
|
2759
CALL
Kforce
KFRC
$983M
| $1.31M | ﹤0.01% |
+19,400
| New | +$1.24M |
|
2760
ARK Web x.0 ETF
ARKW
$1.64B
| $1.31M | ﹤0.01% |
17,248
+7,730
| +81% | +$481K |
|
2761
CALL
Neogen
NEOG
$2.05B
| $1.31M | ﹤0.01% |
65,100
-121,400
| -65% | -$2.05M |
|
|
TEN
2762
PUT
Tsakos Energy Navigation Ltd
TEN
$1.19B
| $1.31M | ﹤0.01% |
58,900
+41,300
| +235% | +$879K |
|
2763
CALL
SLM Corp
SLM
$4.57B
| $1.31M | ﹤0.01% |
68,400
+61,700
| +921% | +$932K |
|
2764
Xenon Pharmaceuticals
XENE
$6.32B
| $1.31M | ﹤0.01% |
28,387
+17,652
| +164% | +$624K |
|
2765
CALL
Amylyx Pharmaceuticals
AMLX
$2.05B
| $1.3M | ﹤0.01% |
88,600
-75,900
| -46% | -$1.16M |
|
2766
Webster Financial
WBS
$12.3B
| $1.3M | ﹤0.01% |
25,678
+17,848
| +228% | +$771K |
|
2767
PUT
Nextpower Inc
NXT
$15.2B
| $1.3M | ﹤0.01% |
27,800
+17,100
| +160% | +$669K |
|
2768
CALL
Synaptics
SYNA
$4.41B
| $1.3M | ﹤0.01% |
11,400
+3,400
| +43% | +$337K |
|
2769
CALL
TETRA Technologies
TTI
$1.23B
| $1.3M | ﹤0.01% |
287,800
-223,000
| -44% | -$1.13M |
|
2770
CALL
CBIZ
CBZ
$2.29B
| $1.29M | ﹤0.01% |
20,700
+20,400
| +6,800% | +$1.15M |
|
|
SAFE
2771
CALL
Safehold
SAFE
$1.19B
| $1.29M | ﹤0.01% |
55,400
+51,200
| +1,219% | +$965K |
|
2772
Alerian MLP ETF
AMLP
$13B
| $1.29M | ﹤0.01% |
30,422
+21,887
| +256% | +$928K |
|
2773
TAL Education Group
TAL
$5.71B
| $1.29M | ﹤0.01% |
+102,361
| New | +$1.06M |
|
2774
CALL
Compañía de Minas Buenaventura
BVN
$7.85B
| $1.29M | ﹤0.01% |
84,700
+54,400
| +180% | +$525K |
|
2775
PUT
RxSight
RXST
$215M
| $1.29M | ﹤0.01% |
32,000
+31,000
| +3,100% | +$909K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.